| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-pressure measuring device which can measure minute oil pressure that is directly under an oil ring with proper accuracy. SOLUTION: In relation to the oil-pressure measuring device for measuring the oil pressure generated directly under the oil ring 4 of three-piece type acted for a piston 1 of a reciprocative engine, the thicknesses of the parts for a part of the upper layer section of the circumferential direction in a lower rail 7 of the oil ring 4 are reduced, and a slit 7a cut-in in the inside from radial direction outside is placed into both sides sections of the circumferential direction, its cantilever section 9 is formed, and a strain gauge 10, that is mounted on the surface of the cantilever section 9 for measuring the bending distortion of this cantilever section 9 as a substitution value of the oil pressure of the oil ring 4 is provided directly under it. COPYRIGHT: (C)2008,JPO&INPIT
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